What Pooky is suggesting is that CMT would put a skull in each map, and when they are found they activate a script in the UI. Then the UI would activate the "skull menu" and place the picked up skull. (Something among those lines)

I recall CMT saying that they wouldnt put skulls on their maps, since of either not wanting to or UI issues.

Since now l28 from Halomaps is on CMT due to him knowing UI very well (See his RED UI), I believe it COULD be possible.